I think my lower radiator hose is collapsed - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 09-25-2012, 07:55 PM   #1
Boosting since 1984
Thread Starter
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 1,198
Total Cats: 68
Default I think my lower radiator hose is collapsed

"New" block is in with re-worked head. Car runs great, gets up to 8psi on spring alone :-)
But I noticed that at apparently random intervals the engine would start overheating and just keep getting hotter. Had to shut it down and wait to cool off and then it would be OK for another hour or so. Until the temperature would rapidly just climb into high heavens again for no apparent reason.

Symptoms:
- Water temp needle stays pegged at 12 on the clock for extended periods. No variation whatsoever
- Then, seemingly out of nowhere the temp would start climbing and climb VERY fast until I shut off the engine.
- After shutting off and waiting maybe 5 minutes everything's OK.

So I did all the checks. Put in a new thermostat, new rad cap, flushed the system. No change.
Then I realized that it would only happen shortly after running high rpm (up to 7k)

And sure enough. Rev to 7K, then keep cruising at low rpm and maybe 15 seconds later, the temperature quickly runs up all the way. Just shutting down the engine for a few seconds while coasting and then re-starting fixes it and the temp goes back down!

So to me that sounds like a collapsed lower hose - right?
stefanst is offline   Reply With Quote
Old 09-25-2012, 08:22 PM   #2
Elite Member
iTrader: (21)
 
Join Date: Jun 2007
Location: Rochester, NY
Posts: 5,689
Total Cats: 560
Default

Replace 'em both. Cheap insurance.
rleete is offline   Reply With Quote
Old 09-25-2012, 08:40 PM   #3
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,372
Total Cats: 1,334
Default

Open the hood and look at it while you rev it?
Savington is offline   Reply With Quote
Old 09-25-2012, 08:42 PM   #4
Boosting since 1984
Thread Starter
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 1,198
Total Cats: 68
Default

My wife voted against it. She thinks our neighbors are car-hating sissies who wouldn't like the noise!
stefanst is offline   Reply With Quote
Old 09-25-2012, 08:45 PM   #5
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,372
Total Cats: 1,334
Default

Well then you've got two options.

1. Divorce her and move out
2. Drive a couple of miles down the road away from the neighbors, then get out and rev it while you look at it
Savington is offline   Reply With Quote
Old 09-25-2012, 08:59 PM   #6
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,206
Total Cats: 2,587
Default

lol nothing worse than trying to help someone that doesn't even want to help themselves.
18psi is offline   Reply With Quote
Old 09-25-2012, 09:17 PM   #7
Destroyer of Inconel
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Default

Interesting. I had these same symptoms up at T-Hill last time I was out, but I figured it was just regular old overheating.
EO2K is offline   Reply With Quote
Old 09-25-2012, 09:49 PM   #8
Boosting since 1984
Thread Starter
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 1,198
Total Cats: 68
Default

Quote:
Originally Posted by Savington View Post
Well then you've got two options.

1. Divorce her and move out
2. Drive a couple of miles down the road away from the neighbors, then get out and rev it while you look at it
1) Too expensive. And I kind of like her
2) That sounds too much like work. I'd have to get my behind off the sofa. Aaand the cops might disagree with my current blood alcohol levels.

I'll go for option #2, but in the morning when sober...
stefanst is offline   Reply With Quote
Old 09-25-2012, 11:48 PM   #9
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,110
Total Cats: 518
Default

Quote:
Originally Posted by stefanst View Post
I'll go for option #2, but in the morning when sober...
Preferably 5:30am.
curly is offline   Reply With Quote
Old 09-26-2012, 12:41 AM   #10
Boosting since 1984
Thread Starter
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 1,198
Total Cats: 68
Default

Still drinking now. My brother is visiting. Don't think I'll be sober at 5:30!
stefanst is offline   Reply With Quote
Old 09-26-2012, 09:54 AM   #11
Boosting since 1984
Thread Starter
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 1,198
Total Cats: 68
Default

Dang it all to heck. All hoses look nice and not collapsed at all while and after revving.
To add insult to injury, even at low rpm, without ever having revved above 5k, the engine is getting too hot when going up an longer incline on the interstate at 75mph in 5th. No boost. Turning on the heater full-blast helps getting the temp down. But that's a band-aid, not a solution.
The engine never overheated before, even in Miami summer heat. And the only thing that has changed is the new engine block and re-worked head.
When idling, I get nice, steady temperatures. After a few minutes the fan kicks in, runs for maybe a minute, then turns off. And again, and again.

Could it be running too lean or something with the timing?

Setup:
- '97 1.8l block, pistons, rods etc.
- Compression is 170-ish on all four
- '99 head with +1mm Supertech valves
- Stock ECU with FM Link piggyback
- T28, currently running at 9psi to red-line


What I've done:
- checked all hoses and replaced some
- replaced radiator cap
- replaced thermostat
- ran cooling system flush (I think it's citric acid)
- currently running 100% water with water-wetter

Other:
- Lower stock ducting is still in place, but hacked up to fit the IC
- No oil can be found in the water and no water in the oil
- outdoor temps are 60s. It's been fine before in over 100 without ANY problem

So I guess it's off to Autozone or Pepboys and see if I can rent a cooling system pressure tester.
Saturday is my Evolution Phase 1 AutoX training. Need the car reliable by then!
stefanst is offline   Reply With Quote
Old 09-26-2012, 10:48 AM   #12
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Could it be improper tuning either spark or fuel?
Saml01 is offline   Reply With Quote
Old 09-27-2012, 12:17 AM   #13
Boosting since 1984
Thread Starter
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 1,198
Total Cats: 68
Default

It appears this could be another one for the "epic fail" thread that faeflora proposed. Or just call me faestefan.....
Here we go. Go easy on the name-calling please:
It appears I installed the thermostat the wrong way round. Ouch. Stupid.

In my excuse, I installed it the same way round as the thermostat that was installed before. And I hired that mechanic for money!

So I thought about what could cause my symptoms and thought: Thermostat. But I replaced it and there was no improvement!
Then I remembered that it did seem odd- the way it was installed. Checked online and sure enough: Everybody else seems to install their thermostat the other way round...

Flipped it, went for a test-drive and before I could get 2 miles away, the Link-ECU died on me. Car is stranded now. Bloody-bleeding-goshdurn (&%*#&$#* ECU!

More tomorrow.

Last edited by stefanst; 09-27-2012 at 12:32 AM.
stefanst is offline   Reply With Quote
Old 09-27-2012, 02:59 PM   #14
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,372
Total Cats: 1,334
Default

That'll do it. :P
Savington is offline   Reply With Quote
Old 09-28-2012, 12:14 AM   #15
Boosting since 1984
Thread Starter
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 1,198
Total Cats: 68
Default

The problem last night was not the Link ECU. It' a short somewhere in the 'engine' circuit.

See this thread: Electric Gremlins Thread
stefanst is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 12-15-2017 09:00 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:00 AM.